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.IOIIN I. SIMMONS, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO SQUIRE V.MOONEY, OF SAME PLACE.

DIRECT-ACTING ENGINE.

SPECIFICATION forming part of Letters Patent No. 613,806, dated November8, 1898.

Application iil'ed May 25, 1897. Serial No. 638.145. (No model.)

To all whom it may concern.-

Beit known that I, JOHN P. SIMMONS, a citi- 'zen of the United States,residing in the city and county of San Francisco, State of California,have invented a new and useful Improvement in Direct-Acting Engines,ofwhich the following is a specification.

This invention relates to the class of engines designed particularly tooperate impact rockdrills; and its object is to provide a cheap, simple,and efficient valve mechanism for this class of devices.

It consists in the novel construction and combination of theseveral-parts hereinafter fully described and specifically claimed.

The device is illustrated in the accompanying drawings, in which- Figurel is an elevation of my invention, portions being in section. Flo'. 2 isa plan, parts of which are also in section.

Referring to the drawings, A is a cylinder having a valve-chest aopening directly from its bore. This valve-chest is parallel-sided,closed on top, and extends radially outward from the cylinder.

As the parts on either side of the middle point in the length of thecylinder are duplicates of those on the other side a description of oneside will suffice.

A valve-port c opens into passage a2, leading to and communicating withthe end of cylinder A.` Opposite to port a in the other side of thevalve-chest ais an outlet-aperture a3. Fitted between the parallel sidesof the valve-chest is a rock-arm B, pivoted upon a pin b. The end of therock-arm B is provided with -a radial slot or passage b,suitably placedto coincide with the ports cand d3 in o ne position of rock-arm B. Uponthe side of B adjacent to a3 it is'provided with a packingring b2. Aspring-ring b3 is also provided, adapted to press the packing-ringsnugly against the parallel side of the valve-chest. The inner end ofthe ring b2 is beveled inward, and the bottom of the pocket in which h2fits is likewise inwardly beveled, and between these two beveledsurfaces the spring-ring h3 is compressed radially inward, Fig. 2.

The rock-arm B is pivoted upon the pin C,

passing from side to side of the valve-chest and secured in place by anut.

In the cylinder A is located a suitable piston F, having a portion ofits length intermediate of its ends reduced in diameter and the portionsbetween the larger and smaller diameters suitably sloped or curved toact as cam-surfaces to actuate the valve rock-arm B. A tappet or lug h4is provided upon the inner side of each end of B, adapted to projectinto the cylinder-bore and engage with the sloping portion of the pistonF, each end alternately. D is an inlet-aperture for the admission of theactuating fluid. E is an outlet or exhaust. i

The operation of the device is as follows: Movement of the piston Frocks the arm B by contact of the incline portion with one end tappetb4, thus bringing the passage through that end of rock-arm B coincidentwith port a' and exhaust a3 and at the same time uncovering the port cof the other end of the cylinder, thus reversing the direction of theactuating fluid, and consequently the direction of motion of theengine-piston F. This forms one cycle, which is repeated indelinitely.

l. In a direct-acting engine, a cylinder, a piston therein havingvalve-operating inclines intermediate of its ends, a parallelsidedvalve-chest extending radially outward from the cylinder and havingports in one of its parallel sides, and a rocking arm having a throughport or passage adapted to control the said ports and be directlyactuated by the piston.

2. In a direct-acting engine, a cylinder, a piston therein havingvalve-operating inclines intermediate of its ends, a pivoted valvehaving a through port or passage and adapted to rock in a plane radialto the cylinder, and a valve-seat parallel to the plane of motion of thevalve upon which the valve slides.

3. In a direct-acting engine, a cylinder having a parallel-sidedvalve-chest extending radially outward with port-openin gs in theparallel sides, and a valve sliding between the parallel sides having athrough passage inner end, and a spring-ring acting upon the adapted toConnect and to form a Communibeveled portion by radial expansion wherebycation between the port-openings in the opthe packing-ring is forcedoutward.

posite sides of the valve-chest. JOI-IN P. SIMMONS.

Il. A sliding valve provided with an out- Witnesses: wardly-movablepacking-ring iitted into its W. A. MCKOWEN, reverse side, said ringbeing beveled on its J. MILLER.

